bio mls should be in the same research as bio mg...spending 120secs or w/e to research something like bioml that btw requires a heavy tank...thats why noone ever bother to use them...
yea thats true, i just noticed today on escort with my comp fitted dual HE bio ml heavy ;=) but still, the research is extreeeemely long to get them....
Plasma if the perfect weapon for experienced players. You can even defeat people with Bio Engines(Remember, coolant is faster). Nothing is wrong with plasma, you just have to be a good tank gunner and driver.